Container base



FIG. 1 is a top, front perspective view of a first embodiment of a container base showing my new design;

FIG. 2 is a bottom, rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a left side elevational view thereof; and

FIG. 8 is a right side elevational view thereof.

FIG. 9 is a top, front perspective view of a second embodiment of a container base showing my new design;

FIG. 10 is a bottom, rear perspective view thereof;

FIG. 11 is a top plan view thereof;

FIG. 12 is a bottom plan view thereof;

FIG. 13 is a front elevational view thereof;

FIG. 14 is a rear elevational view thereof;

FIG. 15 is a left side elevational view thereof; and

FIG. 16 is a right side elevational view thereof.

FIG. 17 is a top, front perspective view of a third embodiment of a container base showing my new design;

FIG. 18 is a bottom, rear perspective view thereof;

FIG. 19 is a top plan view thereof;

FIG. 20 is a bottom plan view thereof;

FIG. 21 is a front elevational view thereof;

FIG. 22 is a rear elevational view thereof;

FIG. 23 is a left side elevational view thereof; and,

FIG. 24 is a right side elevational view thereof.

Broken lines shown in the drawings represent portions of the container base and form no part of the claimed design. 

CLAIM The ornamental design for a container base, as shown and described. 